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Removing and installing second battery A1 beneath front left seat — VW

Removing and installing second battery A1 beneath front left seat on VW: factory workshop procedure. Full factory text, tools and checks.

Workshop procedure for VW — the factory write-up, straight from real workshop data.

factory workshop text

📋 Procedure

Removing and installing
second battery
A1
beneath front left seat
WARNING
Danger of injury! Comply with the warning notices and safety regulations
Chapter
!
An absorbent glass mat battery is also installed beneath the front left seat on some vehicles, depending on the equipment level. This type of battery has set electrolyte (which means it cannot leak), it has a fixed cycle and it is completely maintenance-free.
Absorbent glass mat batteries have greater resistance to weather conditions and are more resistant towards vibrations than conventional lead-acid batteries. In addition, absorbent glass mat batteries do not leak or become damaged if they are tilted or subjected to gravitational forces.
Special tools and workshop equipment required
Torque wrench
V.A.G 1410
Removing
Remove front left seat
General body repairs, interior
Rep. gr.
72
Front seats; Removing and installing front seat
.
Disconnecting
battery
A
on left in engine compartment
Chapter
.
Disconnect second battery beneath front left seat
Chapter
.
If fitted, pull hose for central venting off battery.
Unscrew securing bolt
arrow
and remove clamp plate.
Swivel up battery handles
arrows
.
Hold battery by handles and lift it out from bracket under seat.
Installing
Caution
A loosely installed battery creates the following dangers:
Reduced service life due to damage from vibration (danger of explosion)
The cells in the battery will be damaged if the battery is not secured correctly.
Damage to battery housing by securing bracket (possibility of acid leaking, with high consequential costs)
Poor crash safety
Bring clamp plate into position and tighten securing bolt
arrow
.
Note
If fitted, connect the hose for central venting to the battery.
The hose for central venting must not be pinched when installing. Otherwise the battery won't be able to vent freely.
After installing
second battery
A1
, ensure it is firmly seated.
Connect second battery beneath front left seat
Chapter
.
Install front seat
General body repairs, interior
Rep. gr.
72
Front seats; Removing and installing front seat
.
Reconnect
battery
A
on left in engine compartment
Chapter
.
Specified torques
Chapter
“
Assembly overview - battery
”

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Workshop data on this page last updated 20 Sep 2026.